i played a little receiving different available navigation sats with BETA and external uBlox M8N receiver.
If i set receiver receive only Galileo and BeiDou i get a sat fix, little problem the displayed flag for BeiDou is US and the symbol is round point, so i think locus detect BeiDou sats as GPS.
Next i set receiver to receive GPS and Galileo and BeiDou all works fine, till first BeiDou sat is received. (after~1minute in nmea)
From this moment count of used sats and skyplot jump with cracy values, althought track recording works furthermore.
Attached you´ll find both nmea for simulation